00616332

Component

http://onlinepubs.trb.org...trr/1991/1301/1301-019.pdf

https://scholar.google.co...hang&publication_year=1991

The use of phosphogypsum, a phosphate mining solid waste, was investigated as an aggregate in construction of various roller-compacted concrete (RCC) slabs. Several phosphogypsum-based concrete mixtures were prepared in three different mixing procedures and were compacted using a self-propelled vibratory roller. The results of three projects are described: (a) small slabs of various compositions, (b) a parking lot ramp, and (c) large-scale construction of driveways (including service drive) and parking areas. Field results of all projects were compared with their equivalent laboratory samples to evaluate the performance of the tested mixtures under a less-controlled environment. A thickness design procedure for phosphogypsum concrete pavement was also suggested. The demonstration projects indicate that phosphogypsum-based RCC is suitable for pavement construction application. Phosphogypsum provides additional fineness for better compactibility and surface finishability of final products. It also compensates for some of the dry shrinkage to limit the extent of cracking and retards setting time so that continuity at the cold joints is ensured. When tricalcium aluminate is less than 7% of cement, the presence of calcium sulfate does not adversely affect the sulfate resistance durability of concrete slabs.

This paper appears in Transportation Research Record No. 1301, Factors Affecting Properties and Performance of Pavements and Bridges 1991. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved

01407099

p. 139-148

1991

Transportation Research Record

0309051053

Figures (6) ; Photos (1) ; References (16) ; Tables (8)

Compactibility; Demonstration projects; Driveways; Field tests; Parking lots; Performance evaluations; Roller compacted concrete pavements; Seal coats; Setting (Concrete); Thickness

Phosphogypsum; Setting time

Design; Geotechnology; Highways; Materials; Pavements; Terminals and Facilities; I22: Design of Pavements, Railways and Guideways; I32: Concrete; I36: Aggregates

TRIS, TRB, ATRI

Oct 31 1991 12:00AM

• CHLORIDE CONTENT OF PORTLAND CEMENT CONCRETE POWDER BY A METHOD USING FLOCCULATION
• COMPARISON OF FOUR AGGREGATES USING THE WASHINGTON HYDRAULIC FRACTURE TEST
• CRACKS IN LATEX-MODIFIED CONCRETE OVERLAYS--HOW THEY GET THERE, HOW SERIOUS THEY ARE, AND WHAT TO DO ABOUT THEM
• EFFECT OF FLY ASH ON ALKALI-SILICA REACTIVITY IN CONCRETE
• EFFECTS OF LOS ANGELES ABRASION TEST VALUES ON THE STRENGTHS OF LABORATORY-PREPARED MARSHALL SPECIMENS
• EVALUATION OF PARTICLE SHAPE AND TEXTURE: MANUFACTURED VERSUS NATURAL SANDS
• FLEXURAL CRACKING IN CONCRETE STRUCTURES
• LABORATORY EVALUATION OF THE ALKALI CARBONATE REACTION
• LABORATORY TESTS FOR PREDICTING COARSE AGGREGATE PERFORMANCE IN ONTARIO
• LATEX MODIFICATION EFFECTS ON THE IMPACT RESISTANCE AND TOUGHNESS OF PLAIN AND STEEL-FIBER-REINFORCED CONCRETES
• LATEX MODIFICATION EFFECTS ON THE MECHANISMS OF MICROCRACK PROPAGATION IN CONCRETE MATERIALS
• LIGNITE FLY ASH CONCRETE HIGHWAY PAVEMENT--A 15-YEAR PERFORMANCE HISTORY
• MEASUREMENT OF AGGREGATE SHAPE, SURFACE AREA, AND ROUGHNESS
• MICRO-DEVAL TEST FOR EVALUATING THE QUALITY OF FINE AGGREGATE FOR CONCRETE AND ASPHALT
• PHYSICAL CHARACTERISTICS OF POLISH RESISTANCE OF SELECTED AGGREGATES
• RAPID, ACCURATE METHOD FOR THE DETERMINATION OF SULFUR TRIOXIDE IN HYDRAULIC CEMENT
• RESTORING SKID RESISTANCE TO CONCRETE PAVEMENTS AND BRIDGE DECKS USING A LATEX-MODIFIED PORTLAND CEMENT SLAG SLURRY
• SILICA FUME, LATEX-MODIFIED PORTLAND CEMENT MORTARS AND CONCRETES
• USE OF HIGH-VOLUME CLASS F FLY ASH FOR STRUCTURAL-GRADE CONCRETE
• VISUALIZATION OF CHLORIDE DISTRIBUTION IN CONCRETE (ABRIDGMENT)